Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive
Patent
1994-11-08
1996-05-07
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Polarity-responsive
335 80, 335130, H01H 5122
Patent
active
055150195
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a polarized electromagnetic relay having a coil, an elongated permanent magnet which is arranged above the coil and parallel to the coil axis and which has like end poles at each of its two ends and a center pole opposite thereto in its center, having a core which is arranged inside the coil and which is coupled at both ends to the two ends of the permanent magnet by means of yoke legs and also having an elongated rocking armature which is mounted above the center pole of the permanent magnet and forms a working air gap with each of the two yoke legs.
Such a relay having a three-pole magnet and a rocking armature mounted above the magnet is disclosed, for example, in European reference EP-A-O 197 391. In the latter, however, the contact system is also arranged above the coil in the region of the armature, the contact springs arranged on both sides of the armature being directly linked to it and performing their switching movements directly with the armature.
The same magnet system having a three-pole permanent magnet and a rocking armature is also already used in German reference DE-A-21 48 377. However, in that case permanent magnet and armature are arranged to the side of the coil and actuating pins attached to the armature ends act on contact springs which are underneath the coil and can be moved in a plane parallel to the base plane of the relay.
Common to these known relays is the fact that the contact elements are situated with small spacings in the region of the armature and of the magnet system. These systems are consequently suitable only for switching low currents.
European reference EP-A-186 160 (corresponding to U.S. Pat. No. 4,688,010) furthermore discloses a relay for switching higher powers in which a housing is subdivided into a coil enclosure for receiving an electromagnet system and a switching enclosure for receiving a contact arrangement. An armature which carries a permanent magnet is arranged in front of the end face of the coil and fits into the contact enclosure by means of a firmly molded-on actuating arm.
SUMMARY OF THE INVENTION
The object of the present invention is to exploit the advantages of the polarized system described at the outset, namely the high sensitivity accompanied by optionally adjustable monostable or bistable switching characteristics and the low sensitivity of the centrally mounted armature to vibrations, for switching higher currents and voltages.
According to the invention, this object is achieved in a relay of the type mentioned at the outset in that the armature is mounted by means of a bearing spring which is attached directly to its center section and can be latched to the permanent magnet on both sides, in that a contact assembly having at least one contact spring arranged approximately parallel to the coil axis and at least one fixed contact element is arranged underneath the coil and in that there is arranged in front of one end face of the coil a slide which can be moved perpendicular to the coil axis and is made of insulating material and which is coupled, on the one hand, to a movable end of the armature and, on the other hand, to a movable end of the contact spring.
In the case of the invention, therefore, the contact elements are arranged at the underside of the relay right next to the connection side, so that short connecting elements do not generate unduly high heat losses even when carrying high currents. Since the armature with the iron parts of the magnet system is situated opposite the contact elements on the upper side of the coil, a large insulating clearance between contact system and magnet system is already produced as a result of the spatial distance. In addition, the coil and the entire magnet system can be screened by suitable structural design of a main body to create long insulating clearances with respect to the contact system. Such a main body, in which, for example, the contact assembly having connecting elements brought out to the underside is arranged, preferably forms a
REFERENCES:
patent: 4551698 (1985-11-01), Aida
patent: 4688010 (1987-08-01), Nobutoki et al.
patent: 4914410 (1990-04-01), Diem et al.
patent: 5243312 (1993-09-01), Schedele
patent: 5289145 (1994-02-01), Schedele
Donovan Lincoln
Siemens Aktiengesellschaft
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